2) Then under the mysite folder create a folder called templates.
3) In the templates folder create your snippet html files...in this example they should be called 3col.html, 2col.html, 1col.html
4) Run a dev build and refresh the cms
5) In the CMS you should now have a new button (see screen shot) when you click it, it will give you a drop down menu of your snippets that you can insert anywhere in the document